Screw-jack.



G. E. MILLER & E. B. CANTRELL.

SCREW JACK.

APPLICATION FILED SEPT. 6.1916- L228,943, Patented June 5, 1917,

* enoner; a MILLER, or OAKLAND,

AND EDWIN B. CANTRELL, OF SAN FRANCISCO, CALIFORNIA.

SCREW- JACK.

Z '0 all whom it mayconcem:

Be it knownthat we, GEORGE E. MILLER, of Oakland, in the county of Alameda and State of- Oalifornia, and EDWIN B. GAN- TRELL, of the city and county of San Francisco andState of California, citizens of the United States, have invented new and useful Improvements in Screw-Jacks of which thefollowing is a specification.

This invention relates to a screw jack.

In garages and shops particularly where repair work is done on Ford cars, it frequently happens that the bearing bushings which ordinarily fit snugly and tight in the rear shaft housing have to be removed either because they are worn or for other reasons. The removal of these bearing bushings has heretofore been accomplished with considerable labor, expenditure of time, etc., and invariably leaves the bushings in such a damaged condition as to prevent their reuse.

The object of the present invention is to provide a simple substantial form of screw jack which is particularly designed to remove the parts referred to with comparative ease, with the least possible expenditure of time and labor, and positively with out damaging the bushings in any manner.

Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawing in which Figure 1 is a side elevation of the screw jack partly in section.

Fig. 2 is a side elevation showing the jack in position to extract a bearing bushing.

Fig. 3 is a cross section on line 33 Fig. 1.

Fig. 4 is a perspective view of the bearing bushing.

Referring to the drawings in detail, and particularly to Figs. 1 and 3, it will be seen that a jack proper comprises a tubular shaped housing A, one end of which is open as at 2 to permit it to be slipped over an axle spindle- 3 such as shown in Fig. 2. The opposite end of the housing is closed by a head 1 through which extends a screw rod 5 provided with a point 6 on its inner end, and a handle or crank 7 on its outer end. Radially positioned near the inner open end of the housing is a lug or pin 8 which is Specification of Letters Patent.

Patented June 5, 191 7.

Application filed September 6, 1916. Serial No. 118,614.

adapted to be projected or retracted by means of a rod 9 which is slidably mounted 1n the housing. A cam extension 10 formed on the inner end of the rod projects througha slot formed in the lower end of pin 8 is adapted to engage with a shoulder 11 to project the pin, and-a secondary pin 12 to retract the pin.

The screw jack here shown is particularly constructed to remove the bearing bushings such as indicated at 13, see Figs. 2 and 4, from the outer ends of axle housings such as are employed-on Ford cars. These bush ings often become worn by the roller bearings, and it is therefore necessary to extract the same to permit new bushings to be inserted. Heretofore the removal of bushings of the type disclosed has been accomplished with considerable labor, expenditure of time, etc., and invariably leaves the bushings in such a damaged condition that they cannot possibly be reused. The provision of a screw jack constructed as here shown overcomes the difficulty of removal, and furthermore positively prevents the bushings from becoming damaged while they are being removed. This is often of greatimportance as it is sometimes found that the bushing is not sufliciently worn to necessitate its renewal, and it is also of great importance where the bushing is removed to permit other repair work to be done. i

The operation of removing the bearing bushing in the present form of jack is effected as follows The rear wheels are first removed, the ball bearings are then extracted and the housing A of the jack placed in the position shown in Fig. 2. The rod 9 is then moved inwardly to project the pin 8 into a perforation 15 formed in the bushing, and the crank 7 is turned to bring the inner pointed end of the screw into engagement with the spindle end. A continued turning movement of the crank will then cause the housing A together with the bushing 13 to move out the time required being limited only by the turning speed of the screw 5. The bushing is in this manner quickly and positively extracted without being damaged in any manner and with comparatively little labor as far as the operator is concerned. If the bushing is only temporarily being extracted to permit other work to be accomplished, or if it is found that the bushing is not sufliciently worn to A warrant its renewal, it can readily be seen that it is only necessary to drive it back into lace. p By referring to Figs. 1 and 2 it will be seen that the housing A is reduced in diameter. This is of considerable importance as it permits the split bushing to contract while it is being extracted. a

The materials and finish of the severa parts of the screw jack may otherwise be such as the experience and judgment of the manufacturer may dictate.

We -wish it understood that various changes in form, proportions and minor'de tails .of construction maybe resorted to within the scope of the appended claims, and that we do not wish to limit ourselves to the specific design or construction here shown.

Having thus described our invention,'what we claim and desire to secure by Letters Patent is 1- 1. A screw j ack comprising a tubular shaped housing open at one end and closed by a head at the opposite end, a screw rod centrally positioned in the head, a lug positioned adjacent the open end of the housing, a rod extending from end to end of the housing and a cam member on the rod engageable with the lug to project or retract the same.

2. In a jack, a casing of hollow formation open at one end so as to engage over the axle spindle and i'nteriorly of the bearing bushing, means projectable beyond the casing periphery at said open end thereof to engage the bushing, and means associated with the casing and engageable with a fixed point extraneous thereto for withdrawlng the casing.

3. In a bearlng bushing jack, a hollow easing having a radial guide, means movable in the guide and projectable beyond the casing periphery to engage the bushing from posed centrally the main exterior body portion of ate the engaging means arranged within the casing and eccentric thereto, and means disof the casing to efiect movement of the casing with relation tothe axle.

Al. .In a ack for removing bushing bearings from axles, means insertible in the interior ofthe bushing to engage the .bushing, means to actuate the engaging means outwardly to engage the bushing while said engaging means is in the bushing, and means operable against a fixed point extraneous to the bushing for withdrawing said engagingmeans. V r

5. In a jack for removingbushing bearings,.a sleeve having a radial openingat its inner end, a-bushing engaging pin slidable through saidopening, a rod disposed interiorly'of the sleeve and eccentric thereto and having means at one end to engage said pin for moving the latter outwardly beyond the sleeve periphery and interiorly thereof, the opposite end of the rod extending beyond the other end. of the sleeve so as to be accessible for operation, and a screw borne by the center of the sleeve and engageable with the, axle'to effect withdrawal of the sleeve.

6. In a jack for removing perforated bushings, a sleeve, means eccentric to; the sleeve and projectable beyond the sleeve periphery to engage the bushing by extending into the perforation thereof, and means arranged centrally of the sleeve to effect withdrawal of the sleeve by engagement with a fixed point extraneous thereto.

In testimony whereof we have hereunto Copies of this patentmay be obtained for five cents each, by addressing the Commissioner of Patents, I

Washington, D. G. 

